<html>
    <head>
        <title>
            按钮
        </title>
        <style>
            #denglu {
                border: 2px solid ;color:black; height: 100px; width: 200px;
                border-radius: 20px;
                
                
            }
            #denglu:active{
                background-color: rgb(57, 27, 129);
            }
        </style>
    </head>
    <body>
        <!-- <form action="www.baidu.com">
        <center> -->
    <input type="button" value="登陆" id="denglu" >
<!-- </center> -->
</form>
    </body>
</html>